the quality of being at hand when needed
"The new manager's availability to handle last-minute crises has made a huge difference in our team's workflow."
The quality of being available.
"The availability of seats for the concert sold out within minutes."
In plain English: Availability means being free and ready to do something when someone needs you.
"The availability of fresh fruit varies depending on the season."
Usage: Use availability to describe the state of being able to do something or be present at a specific time. It commonly refers to whether someone can meet a request or if an item is in stock for purchase.
The word availability entered English in the early 1800s by adding the suffix -ity to the existing adjective available. It has retained its original meaning of being accessible or ready for use ever since it was first recorded.